MEDIUM EFFECTS ON THE DOUBLE-DELTA PRODUCTION AND ABSORPTION CROSS-SECTION

The explicit expressions for calculating the in-medium N+N-->Delta+Del ta and Delta+Delta-->N+N cross section have been derived within the fr amework of the self-consistent relativistic Boltzmann-Uehling-Uhlenbec k approach in which the deltas and nucleons are treated on an equal fo oting. The obtained cross sections are consistent with the other integ rands of the transport model. The theoretical prediction of the free d ouble-Delta production cross section is in good agreement with the exp erimental data. All the medium effects on the double-Delta production and absorption cross section are studied systematically, and strong me dium corrections are found. Our numerical results show that it would b e important to take the N+N-->Delta+Delta and Delta+Delta-->N+N channe l into account in the study of relativistic heavy-ion collisions at in termediate and high energies.